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Income Taxes (Activity In Deferred Income Tax Asset Valuation Allowance) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Income Taxes [Abstract]
Beginning balance	$ 15,076	$ 3,815	$ 3,397
Charged to costs and expenses	394	11,269	663
Deductions	(10,940)	(8)	(245)
Ending balance	$ 4,530	$ 15,076	$ 3,815

X

- Definition

Deferred Tax Assets Valuation Allowance, Charged To Costs And Expenses

+ References

No definition available.

+ Details

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Namespace Prefix:	fc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Deferred Tax Assets Valuation Allowance, Deductions

+ References

No definition available.

+ Details

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Namespace Prefix:	fc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

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